原理可以看这篇文章,这里只封装工具类
package com.sjmama.ucenter.utils;
import lombok.experimental.UtilityClass;
import java.util.HashMap;
import java.util.Map;
@UtilityClass
public class ThreadLocalUtils {
/*使用常量定义一个key*/
public static final String USER_KEY = "USER_KEY";
private static final ThreadLocal<Map<String, Object>> THREAD_LOCAL = new ThreadLocal<>();
/**
* 存储
*
* @param key
* @param value
* @return void [返回类型说明]
* @author nijia
* @see [类、类#方法、类#成员]
*/
public static void put(String key, Object value) {
Map<String, Object> map = THREAD_LOCAL.get();
if (map == null) {
map = new HashMap<>();
}
map.put(key, value);
THREAD_LOCAL.set(map);
}
/**
* 取值
*
* @param key
* @return T [返回类型说明]
* @returnt
* @author nijia
* @see [类、类#方法、类嗯#成员]
*/
public static <T> T get(String key) {
Map<String, Object> _map = THREAD_LOCAL.get();
if (_map != null) {
return (T) _map.get(key);
}
return null;
}
public static void release() {
THREAD_LOCAL.remove();
}
}
